What I have been told is the tricnomes go from clear to white to brown - you can harvest from white-brown and depending on how many brown tricinomes there are you either get a less incapacitating high, the more brown the more of a couch high you get. Im on my first grow so I am splititng my plants into 2 harvests each. I am going to harvest the head nugget when its white/5% brown and the rest of the plant at like 20% brown. Gunna do that for both of my plants to determine for myself what the difference is between the two!
Good luck to ya they look beautiful
EDIT** Many people will argue that CDC's (more brown tricinomes) can/will ruin your crop if done wrong, they're right and wrong. From all the books I've read CDC's are actually the medical aspect of bud itself, THC is what gets you high. I'm not 18 trying to get high and impress my friends lol I have some serious medical issues and I personally am going to try both ways to see what works for me.